Models, no (sans Smash 3DS). But the coding, frame data, and obviously the moveset are frequently transferred. Plus, it is a lot easier and less time consuming to just "redo" or "slightly change" a character than to make one from scratch.
Pretty much what I'm thinking. I think people assume models are imported and then touched up, but this isn't a Capcom fighter.
I was just meaning by that, look at how Toon Link fights with his basic attacks in the Wind Waker (HD). Put that in smash. It's a lot of jumping, slashing, and requires a lot of movement, but boy oh boy does that make it more exciting!!!
Oh, I'd love that. Honestly, I"d love for more movement heavy characters in the game. It's one reason why Xiaoyu and El Fuerte are my favorite characters in fighting games. Still, there are a number of ways to go about it. Just looking at what we have so far:
Zero Suit Samus - Please, please, PLEASE, make her like her PM incarnation with less whip moves.
Squirtle - LOVE what they did for him in Project M. Make him like that and he's on his way to being a punishing maniac.
Sonic - Reset heavy mutha****a, making DI'ing a beautiful mess.
Tink - Evasive with pokes, bombs, arrows, and boomerangs. Sort of an aggressive zoner.
Toad - A more high risk, high reward evasive character with deadly grapples and combos.